Clock stand



FIG. 1 is a front elevational view of a clock stand showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a left side elevational view thereof.

The broken line showings of a clock in all figures are environmental only and form no part of the claimed design. 

The ornamental design for a clock stand, as shown and described. 